Apparatus for heating fluids.



No. 777,083. PATENTBD 13110.18, 1904.

B. W. DAVIS.

APPARATUS FOR HEATING FLUIDS.

APPLICATION FILED SEPT. 14, 1903.

NO MODEL.

UNITED STATES Patented December 13, 1904.

PATENT OEEIcE.

APPARATUS FUR HEATING. FLUIDS SPECIFICATION forming part of Letters Patent N 0. 777,083, dated December 13, 1904. Application filed September 14, 1903. Serial No. 173,065. (No model.)

To all whom it may concern.-

Be it known that I, BENJAMIN W. DAVIS, a citizen of the United States, residing at Phillips, county of Price, State of \Visconsin, have invented a certain new and useful Improvement in Apparatus for Heating Fluids; and I declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference beinghad to the accompanying drawings, which form a part of this specification.

My invention has for its object the production of an apparatus for the economical heating of water or other fluid or the production of steam whereby the greatest efliciency of the heat can be utilized--that is, the greatest number of heat units be absorbed by the fluid.

The invention is applicable either as a boiler for originally generating steam or heating water or other fluid or it is applicable as a socalled fuel-economizer -that is, an apparatus located in the stack of a boiler or furnace or elsewhere to take up and utilize the otherwise waste products of combustion or other waste heat.

Figure 1 is a vertical section of an apparatus embodying my invention. Fig. 2 is a crosssection on the line 2 2 of Fig. 1.

In carrying out the invention A represents any suitable flue or chamber containing heat generated in any desired manner, the heat passing in the direction of arrow No. 1 and out of the stack B at arrow No. 2.

C is a coil of pipe in the stack B. These coils may be arranged in any suitable manner; but Iprefer to arrange them, as shown, with one portion of c of each coil at a higher level than the lower portion 0 of the coil next above. Supporting-pieces C may, if desired, be provided to support the coil.

1) represents the inlet, and E the outlet, of the coil.

I have found that with the current of heating fluid passing in the direction indicated (in this instance up the stack) I can by introducing the heat-absorbing fluidas, for instance, water-at the inlet D, preferably under pressure, and forcing it down through the coil in a direction opposite to the current of heat and opposite to the direction it would naturally take (which would in this instance be upward) it absorbs the heat units much more efl'ectively, since the cold water is introduced where the heat is lessened and discharged where the heat is greatest. By making the coil, as shown, with a portion of each convolution at a higher level than the lower portion of the convolution next above there will, in addition to the forced circulation above referred to, be a natural circulation in each convolution.

While I have herein described but a single form of apparatus for utilizing my invention, it is obvious that various forms might be utilizcd without departing from the spirit of the invention, which consists, essentially, in forcing a current of the heat absorbing fluid through a conduit comprising communicating sections, each section arranged on an incline with its upper portion in a plane above the plane of the lower portion of the next higher section in a direction opposite to that which it would naturally follow and in a direction opposite to the direction of the current of the heating medium. I

What I claim is 1. An apparatus for heating a fluid consisting in a conduit composed of communicating inclined sections, the upper portion in each section being in a plane above the plane of the lower portion of the adjacent higher section,

a surrounding heating-chamber, an inlet at the upper end of said conduit, an outlet at the lower end of said conduit, and means for causing the fluid to circulate through the conduit from the upper end of the top section thereof to the lower end of the bottom section in a direction opposite to the flow of the heating medium through the chamber.

2. An apparatus for l'ieating a fluid consisting of a vertical seriesof convoluted pipes, each convolution arranged on an incline, the

upper portion of each conx rolution being in a a direction opposite to the flow of the heating horizontal plane entirely above the horizontal fluid. I0 plane in which the lower portion of the con- In testimony whereof I sign this specificavolution neXt above is located, a surrounding tion in the presence of two witnesses. heating-chamber, an inlet at the upper end of BENJAMIN WV. DAVIS.

the coil, an outlet at the lower end of the coil, Witnesses:

and means for causing the fluid to circulate WALTER H. CHAMBERLIN,

from the top to the bottom of the coil and in MILDRED B. STILEs. 

